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<pre><code><span class="keyword">extern</span> <span class="keyword">crate</span> <span class="self_keyword crate_root">self</span> <span class="keyword">as</span> <span class="module crate_root declaration">this</span><span class="semicolon">;</span>
<span class="keyword">extern</span> <span class="keyword">crate</span> <span class="module crate_root default_library library">std</span><span class="semicolon">;</span>
<span class="keyword">extern</span> <span class="keyword">crate</span> <span class="module crate_root default_library library">alloc</span> <span class="keyword">as</span> <span class="module crate_root declaration">abc</span><span class="semicolon">;</span>
<span class="keyword">extern</span> <span class="keyword">crate</span> <span class="unresolved_reference">unresolved</span> <span class="keyword">as</span> <span class="module crate_root declaration">definitely_unresolved</span><span class="semicolon">;</span>
<span class="keyword">extern</span> <span class="keyword">crate</span> <span class="unresolved_reference">unresolved</span> <span class="keyword">as</span> <span class="punctuation">_</span><span class="semicolon">;</span>
<span class="keyword">extern</span> <span class="keyword">crate</span> <span class="module crate_root default_library library">test</span> <span class="keyword">as</span> <span class="module crate_root declaration">opt_in_crate</span><span class="semicolon">;</span>
<span class="keyword">extern</span> <span class="keyword">crate</span> <span class="module crate_root default_library library">test</span> <span class="keyword">as</span> <span class="punctuation">_</span><span class="semicolon">;</span>
<span class="keyword">extern</span> <span class="keyword">crate</span> <span class="module crate_root default_library library">proc_macro</span><span class="semicolon">;</span>
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